Custom PCB Design for Energy & Solar Power Systems
Solar and energy electronics fail where the volts and amps are highest: the DC bus, the MPPT switch node, and the isolation barrier. We design power-stage PCBs around creepage, thermal, and surge reality instead of treating layout as an afterthought. Every board is built to pass HiPot, survive lightning-induced transients, and run cool under full irradiance.
Challenges specific to Energy & Solar
DC-bus arcing and creepage flashover
1000 V string voltages bridge under-spaced copper through humidity, dust, and pollution-degree-3 outdoor conditions, causing carbon-track arcing.
MPPT power stage runs too hot
Switch-node FETs, inductors, and shunts dump tens of watts into thin copper with no thermal path, derating output and aging solder joints.
Surge and lightning kill the board
Nearby strikes inject kV common-mode transients onto long PV strings, punching through gate drivers and sense lines that lack a clamp path.
Reverse polarity destroys the input
Field techs swap PV+ and PV- or batteries during install, back-feeding the bus and frying input FETs, controllers, and reverse-blocking diodes.
Isolation barrier breaks down
Primary-to-secondary and bus-to-comms barriers leak or flash over because clearance, creepage, and slot routing never met the working voltage.
How GizanTech solves them
- 1. Creepage-first DC-bus layout. We spec copper spacing to IEC 62109-1 pollution-degree-3 tables, add conformal coating, and route slots under high-voltage gaps to break creepage paths.
- 2. Thermally modeled MPPT stage. We place FETs and shunts on copper pours with thermal vias to a backside plane, size the switch loop tight, and validate junction rise with IR scans.
- 3. Surge and lightning protection chain. We add staged MOV plus TVS clamping, gas-discharge tubes on PV inputs, and a defined surge return so kV transients shunt before reaching logic.
- 4. Reverse-polarity hardening. We use ideal-diode P-FET blocking on inputs, polarized connectors, and a sense-and-latch crowbar so a swapped install cannot back-feed the bus.
- 5. Verified isolation barriers. We design primary-secondary creepage and clearance for the rated working voltage, add isolation slots, and confirm with 3 kV HiPot on every build.
| Rule | Standard / spacing target | Failure mode | Layout action |
|---|---|---|---|
| DC-bus creepage / clearance | IEC 62109-1, pollution degree 3: 8.0 mm creepage at 1000 Vdc | Carbon-track arcing, flashover across contaminated surface | Widen copper gaps, mill isolation slots, apply conformal coat |
| Reverse polarity | Block full reverse PV / battery bus voltage, < 30 mV drop | Input FETs and controller back-fed and destroyed on install | Ideal-diode P-FET block plus polarized, keyed connectors |
| MPPT power stage thermals | Tj < 110 C at full irradiance, < 40 C copper rise | FET / inductor overheat, derate, solder-joint fatigue | 2 oz pour, thermal-via array to backside plane, tight loop |
| Surge / lightning | IEC 61643 / 8-20 us, clamp 6 kV combination wave | Gate driver and sense lines punctured by common-mode kV | Staged GDT + MOV + TVS, defined surge return path |
| Isolation barrier | Reinforced, 3 kV HiPot, >= 6.4 mm creepage at working V | Primary-secondary leakage, barrier flashover under fault | Route isolation slot, no traces in gap, verify each HiPot |
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Frequently asked questions
What voltage class can you design solar PCBs for?
We design for 600 V, 1000 V, and 1500 Vdc string buses, spacing copper and isolation to the IEC 62109 creepage tables for the rated working voltage and pollution degree.
How do you keep the MPPT stage from overheating?
We thermally model the switch node, use heavy copper pours with via arrays to a backside plane, keep the switching loop tight, and confirm junction rise with IR scans at full load.
Do you handle surge and lightning protection?
Yes. We design a staged clamp chain of gas-discharge tubes, MOVs, and TVS diodes with a defined surge return so induced kV transients shunt to ground before reaching control logic.
Can the board survive a reversed PV or battery connection?
We add ideal-diode P-FET reverse blocking and keyed, polarized connectors so a swapped install during field commissioning cannot back-feed the bus and destroy the input stage.
Do you certify isolation and run HiPot testing?
We design reinforced primary-to-secondary barriers to the working voltage and verify every assembled board with a 3 kV HiPot dielectric test plus isolation resistance checks.