{"id":12900,"date":"2026-09-27T02:05:26","date_gmt":"2026-09-27T02:05:26","guid":{"rendered":"https:\/\/www.krlpower.com\/?p=12900"},"modified":"2026-09-28T06:01:56","modified_gmt":"2026-09-28T06:01:56","slug":"bess-transformer-capacity-expansion","status":"publish","type":"post","link":"https:\/\/www.krlpower.com\/ar\/bess\/bess-transformer-capacity-expansion\/","title":{"rendered":"BESS for Transformer Capacity Expansion: Add Factory Load Without an Immediate Transformer Upgrade"},"content":{"rendered":"
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"KRL-B261L\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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Factory expansion does not always require an immediate transformer replacement. When a new production line creates a measured, time-limited power deficit, specify KRL-B261L for the 125 kW class, KRL-B522L for the 250 kW class, or KRL-B2M6L when expansion reaches 750 kW or 1 MW<\/strong>. The battery must also have enough energy and a real recharge window between events.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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\u0627\u0644\u0640 KRL-B261L 125 \u0643\u064a\u0644\u0648\u0648\u0627\u0637 \/ 261 \u0643\u064a\u0644\u0648\u0648\u0627\u0637\/\u0633\u0627\u0639\u0629<\/a><\/strong> gives a factory a defined smaller power block. The KRL-B522L 250 \u0643\u064a\u0644\u0648\u0648\u0627\u0637 \/ 522 \u0643\u064a\u0644\u0648\u0648\u0627\u0637\u00b7\u0633\u0627\u0639\u0629<\/a><\/strong> doubles that cabinet power class. Expansion involving several feeders belongs in the KRL C&I ESS class-selection path<\/a><\/strong> before equipment is ordered.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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Separate a Temporary Power Deficit from Permanent Transformer Undersizing<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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BESS solves a transformer-capacity problem when the factory has enough energy available over the operating day but cannot supply enough instantaneous power<\/strong> during specific production periods.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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A plant may have a 500 kW usable import boundary while the existing process normally consumes 400–430 kW. Adding a machine that occasionally lifts plant demand to 600 kW creates a temporary 100 kW deficit. Battery storage can inject that missing 100 kW while keeping transformer import near the established limit.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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The same logic fails when expansion pushes the plant above its supply capability for most of the day. A 500 kW connection feeding a new 620 kW continuous production profile has no meaningful recovery period. Storage would discharge while production is high and find insufficient spare grid capacity to recharge before the next cycle.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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\u062d\u0627\u0644\u0629 \u0627\u0644\u0645\u0648\u0642\u0639<\/th>What it means for the BESS decision<\/th><\/tr><\/thead>
New demand exceeds available import only during identifiable periods<\/td>Storage can target a defined power deficit<\/td><\/tr>
Excess demand lasts for a measurable number of minutes or hours<\/td>Required battery energy can be calculated<\/td><\/tr>
Spare import capacity or approved PV energy exists later<\/td>The battery can recover before the next event<\/td><\/tr><\/tbody><\/table><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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When all three are present, storage can defer an immediate transformer project while supporting factory expansion. When the third condition is absent, transformer or utility-capacity expansion remains part of the long-term electrical solution.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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Calculate the Real Capacity Gap in kW, kVA and Amps<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Transformer nameplate kVA is not the BESS power requirement. Start from the maximum import that the existing transformer, utility connection, protection scheme and operating policy can actually support. Compare that boundary with the new coincident factory demand.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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Required BESS power = New coincident site demand − permitted transformer\/grid import<\/code><\/strong><\/p>\t\t\t\t<\/div>\n\t\t\t\t

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A factory limited to 500 kW that reaches 600 kW after expansion creates 600 kW − 500 kW = 100 kW<\/strong>. That is a 100 kW battery-support requirement, not a 600 kW battery requirement.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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Real factory systems also need an apparent-power and current check. At a three-phase connection: kVA = √3 × Voltage × Current \/ 1000<\/code><\/strong> and approximately Current = kW \/ (√3 × Voltage × power factor)<\/code><\/strong>.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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Power factor matters. At 400 V and 0.95 power factor, a 100 kW contribution is about 152 A. A 210 kW contribution is about 319 A. KRL publishes 189 A maximum AC current for B261L<\/strong> \u0648 375 A \u0644\u0640 B522L<\/strong>, so current can reject a configuration even when the simple kW calculation appears acceptable.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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\u0627\u0644\u0640 KRL motor-start review<\/a><\/strong> covers the next constraint: a production line can remain below its running kW limit and still exceed the PCS envelope when compressors, pumps or process motors start together.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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Specify KRL-B261L When the Deficit Stays Inside the 125 kW Class<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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KRL-B261L is the first product screen when factory expansion creates a measured deficit that remains inside the 125 kW cabinet class.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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\u0645\u0648\u0627\u0635\u0641\u0627\u062a B261L<\/th>\u0627\u0644\u0642\u064a\u0645\u0629 \u0627\u0644\u0645\u0646\u0634\u0648\u0631\u0629<\/th><\/tr><\/thead>
\u0627\u0644\u0642\u062f\u0631\u0629 \u0627\u0644\u0643\u0647\u0631\u0628\u0627\u0626\u064a\u0629 \u0627\u0644\u0645\u0642\u0646\u0646\u0629 \u0644\u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u0645\u062a\u0631\u062f\u062f<\/td>125 \u0643\u064a\u0644\u0648\u0648\u0627\u0637<\/td><\/tr>
\u0627\u0644\u0637\u0627\u0642\u0629 \u0627\u0644\u0645\u0642\u0646\u0646\u0629 \u0644\u0644\u0628\u0637\u0627\u0631\u064a\u0629<\/td>261 \u0643\u064a\u0644\u0648\u0648\u0627\u0637\/\u0633\u0627\u0639\u0629<\/td><\/tr>
\u0627\u0644\u062d\u062f \u0627\u0644\u0623\u0642\u0635\u0649 \u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u0645\u062a\u0631\u062f\u062f<\/td>189 \u0623<\/td><\/tr>
\u062a\u0648\u0635\u064a\u0644 \u0627\u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u0645\u062a\u0631\u062f\u062f<\/td>400\/230 \u0641\u0648\u0644\u062a \u062a\u064a\u0627\u0631 \u0645\u062a\u0631\u062f\u062f<\/td><\/tr>
Maximum PV input<\/td>120 \u0643\u064a\u0644\u0648\u0648\u0627\u0637<\/td><\/tr>
\u0648\u0642\u062a \u0627\u0644\u062a\u0628\u062f\u064a\u0644<\/td><10 \u0645\u0644\u0644\u064a \u062b\u0627\u0646\u064a\u0629<\/td><\/tr>
\u0627\u0644\u0642\u062f\u0631\u0629 \u0639\u0644\u0649 \u0627\u0644\u062a\u0634\u063a\u064a\u0644 \u0627\u0644\u0645\u062a\u0648\u0627\u0632\u064a<\/td>Up to 10<\/td><\/tr>
\u062a\u0628\u0631\u064a\u062f \u0627\u0644\u0628\u0637\u0627\u0631\u064a\u0629<\/td>\u0627\u0644\u062a\u0628\u0631\u064a\u062f \u0627\u0644\u0633\u0627\u0626\u0644<\/td><\/tr>
\u0639\u0644\u0628\u0629 \u0627\u0644\u0628\u0637\u0627\u0631\u064a\u0629<\/td>IP65<\/td><\/tr><\/tbody><\/table><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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A factory with a 90–110 kW expansion deficit does not need to jump directly to a 250 kW cabinet merely because total factory consumption is much larger. The existing transformer continues carrying the permitted base import while B261L supplies the missing portion.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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Consider a new production stage that creates a 100 kW deficit for 45 minutes: 100 kW × 0.75 h = 75 kWh<\/code><\/strong>. The power requirement fits the 125 kW class and the initial load-side energy requirement is 75 kWh.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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That does not mean 261 kWh should be treated as 261 kWh of guaranteed delivered AC energy. Final operation must retain the agreed SOC window and account for conversion losses, cabinet auxiliaries, temperature, reserve requirements and battery condition.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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The cabinet's published 120 kW PV input and diesel-generator port also give the project additional operating routes after the transformer-capacity problem has been solved.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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Move to KRL-B522L When the Expansion Gap Reaches the 250 kW Class<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Once the measured deficit moves beyond B261L's power or current boundary, specify KRL-B522L before forcing a smaller cabinet into a duty it cannot carry.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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\u0645\u0648\u0627\u0635\u0641\u0627\u062a B522L<\/th>\u0627\u0644\u0642\u064a\u0645\u0629 \u0627\u0644\u0645\u0646\u0634\u0648\u0631\u0629<\/th><\/tr><\/thead>
\u0627\u0644\u0642\u062f\u0631\u0629 \u0627\u0644\u0643\u0647\u0631\u0628\u0627\u0626\u064a\u0629 \u0627\u0644\u0645\u0642\u0646\u0646\u0629 \u0644\u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u0645\u062a\u0631\u062f\u062f<\/td>250 \u0643\u064a\u0644\u0648\u0648\u0627\u0637<\/td><\/tr>
\u0627\u0644\u0637\u0627\u0642\u0629 \u0627\u0644\u0645\u0642\u0646\u0646\u0629 \u0644\u0644\u0628\u0637\u0627\u0631\u064a\u0629<\/td>522 \u0643\u064a\u0644\u0648\u0648\u0627\u0637\/\u0633\u0627\u0639\u0629<\/td><\/tr>
\u0627\u0644\u062d\u062f \u0627\u0644\u0623\u0642\u0635\u0649 \u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u0645\u062a\u0631\u062f\u062f<\/td>375 \u0623<\/td><\/tr>
\u062a\u0648\u0635\u064a\u0644 \u0627\u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u0645\u062a\u0631\u062f\u062f<\/td>400\/230 \u0641\u0648\u0644\u062a \u062a\u064a\u0627\u0631 \u0645\u062a\u0631\u062f\u062f<\/td><\/tr>
Maximum PV input<\/td>240 \u0643\u064a\u0644\u0648\u0648\u0627\u0637<\/td><\/tr>
\u0648\u0642\u062a \u0627\u0644\u062a\u0628\u062f\u064a\u0644<\/td><10 \u0645\u0644\u0644\u064a \u062b\u0627\u0646\u064a\u0629<\/td><\/tr>
\u0627\u0644\u0642\u062f\u0631\u0629 \u0639\u0644\u0649 \u0627\u0644\u062a\u0634\u063a\u064a\u0644 \u0627\u0644\u0645\u062a\u0648\u0627\u0632\u064a<\/td>Up to 6<\/td><\/tr>
\u062a\u0628\u0631\u064a\u062f \u0627\u0644\u0628\u0637\u0627\u0631\u064a\u0629<\/td>\u0627\u0644\u062a\u0628\u0631\u064a\u062f \u0627\u0644\u0633\u0627\u0626\u0644<\/td><\/tr><\/tbody><\/table><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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A new process combination requiring 210 kW of support<\/strong> already excludes one B261L on power. At 400 V and 0.95 power factor, the corresponding three-phase current is approximately 210,000 \/ (√3 × 400 × 0.95) ≈ 319 A<\/code><\/strong>. That is inside the published 375 A B522L current boundary, subject to the complete project electrical review.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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If that 210 kW deficit lasts 90 minutes, 210 kW × 1.5 h = 315 kWh<\/code><\/strong>. The preliminary power and energy screen points toward the 250 kW \/ 522 kWh cabinet. Delivered AC energy at the project's actual SOC limits still has to be confirmed before the order is frozen.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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One B522L is also not automatically equivalent to two B261L cabinets. The two B261L versus one B522L comparison<\/a><\/strong> separates converter count, current paths, PV interfaces, pads, cabling and future expansion.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tGet a KRL Transformer-Capacity Match for Your Measured Power Gap<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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Move to B2M6L When Factory Expansion Becomes Plant-Scale<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Several expanded production feeders can move the project beyond single-cabinet logic. The KRL-B2M6L plant-scale platform<\/a><\/strong> currently provides two published reference configurations.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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\u0627\u0644\u0625\u0639\u062f\u0627\u062f\u0627\u062a<\/th>Rated power<\/th>\u0627\u0644\u0637\u0627\u0642\u0629 \u0627\u0644\u0645\u0642\u062f\u0631\u0629<\/th>\u0627\u0644\u062d\u062f \u0627\u0644\u0623\u0642\u0635\u0649 \u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u0645\u062a\u0631\u062f\u062f<\/th>Maximum PV<\/th><\/tr><\/thead>
KRL-B1M5L-750H3S-720M6-HX1<\/td>750 \u0643\u064a\u0644\u0648\u0648\u0627\u0637<\/td>1.5 \u0645\u064a\u062c\u0627\u0648\u0627\u0637 \u0633\u0627\u0639\u0629<\/td>1130 A<\/td>720 \u0643\u064a\u0644\u0648\u0648\u0627\u0637<\/td><\/tr>
KRL-B2ML-1MH3S-960M8-HX1<\/td>1000 kW<\/td>2 MWh<\/td>1500 A<\/td>960 \u0643\u064a\u0644\u0648\u0648\u0627\u0637<\/td><\/tr><\/tbody><\/table><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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A factory whose new lines create a 650 kW deficit for 90 minutes requires 650 kW × 1.5 h = 975 kWh<\/code><\/strong>. That duty has already moved beyond one 250 kW cabinet. The 750 kW \/ 1.5 MWh configuration becomes a logical first plant-scale screen because both required power and preliminary load-side energy remain below its published ratings.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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The final choice can still be a parallel cabinet architecture where physical layout, staged expansion or feeder separation favors modular cabinets. KRL's 750 kW \/ 1 MW versus C&I cabinet comparison<\/a><\/strong> covers the point where repeated cabinets stop being the cleanest electrical architecture.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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Size Battery Energy from Deficit Duration, Not Transformer Nameplate<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Transformer capacity determines the power shortage<\/strong>. The length of that shortage determines the first energy calculation: Load-side energy requirement = Power deficit × duration<\/code><\/strong>.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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Power deficit<\/th>Duration<\/th>Initial load-side energy<\/th><\/tr><\/thead>
100 \u0643\u064a\u0644\u0648\u0648\u0627\u0637<\/td>15 min<\/td>25 kWh<\/td><\/tr>
100 \u0643\u064a\u0644\u0648\u0648\u0627\u0637<\/td>45 min<\/td>75 kWh<\/td><\/tr>
100 \u0643\u064a\u0644\u0648\u0648\u0627\u0637<\/td>90 min<\/td>150 kWh<\/td><\/tr>
210 kW<\/td>30 min<\/td>105 kWh<\/td><\/tr>
210 kW<\/td>90 min<\/td>315 kWh<\/td><\/tr>
210 kW<\/td>2 h<\/td>420 kWh<\/td><\/tr>
650 kW<\/td>30 min<\/td>325 kWh<\/td><\/tr>
650 kW<\/td>90 min<\/td>975 kWh<\/td><\/tr>
650 kW<\/td>2 h<\/td>1,300 kWh<\/td><\/tr><\/tbody><\/table><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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These figures describe energy required by the load during the constrained interval. They are not guaranteed battery runtimes. A 100 kW problem lasting 30 minutes and a 100 kW problem lasting four hours need the same PCS power but completely different battery-energy configurations. Selecting the system from transformer kVA alone misses that difference.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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The broader KRL commercial energy storage selection guide<\/a><\/strong> separates power, battery energy and operating objectives before the project reaches detailed design.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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Prove the Recharge Window Before Ordering the Battery<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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A BESS that successfully supports the first production peak can still fail the project if it cannot recharge before the next one. Available recharge energy can be screened from the unused import capacity between constrained periods.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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Recharge headroom = Import limit − normal site demand<\/code><\/strong><\/p>\t\t\t\t<\/div>\n\t\t\t\t

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A plant with a 500 kW import limit may drop to 460 kW after the expanded production batch ends. That leaves 500 kW − 460 kW = 40 kW<\/strong>. Three hours at that level creates 40 kW × 3 h = 120 kWh<\/strong> gross grid headroom.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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A previous 100 kW × 45 minute support event consumed 75 kWh at the load side. The 120 kWh gross grid headroom gives a credible preliminary recovery window, with final charging limits and losses still to be applied.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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Now change the recovery period to only 20 kW of spare import for two hours: 20 kW × 2 h = 40 kWh<\/strong>. That cannot replace a 75 kWh load-side discharge before accounting for charging losses. The battery will enter the next production event at a lower SOC.<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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