A lighting was strike but fuse failed and the felicity 48v 5kwh battery is not powering on.but the inverter is fine.any suggestions? Is it bms?

Had something similar happen to a neighbour's setup last year — lightning took out the BMS on a lithium pack even though the inverter survived completely unscathed. The inverter being fine actually makes BMS failure more likely in your case, not less.

Few things worth checking first:

• Measure the actual cell/pack voltage with a multimeter directly at the battery terminals. If voltage is present but the BMS isn't outputting, that's a strong indicator the BMS protection circuit has latched off or failed outright
• Check for any reset procedure — some Felicity batteries have a physical reset button or a specific button-hold sequence. Worth digging out the manual for that model specifically
• Inspect the BMS comms port and any low-voltage wiring — lightning induced surges often travel through signal wires rather than the main power path

The fuse failing and the BMS going down simultaneously does suggest a significant surge came through. The BMS may have tripped into a protection state rather than being fully dead — there's a difference and it affects whether it's repairable.

If voltage at the terminals reads zero or very low, you're likely looking at a BMS that's locked itself off. Some manufacturers will walk you through a manual wake procedure.

Has anyone here dealt with Felicity's UK support? Curious whether they're helpful with lightning damage claims or whether it's a write-off situation. @anyone with Felicity experience please chip in — OP needs some real-world input on this one.

Classic case of the BMS playing dead while the inverter is out there living its best life 😄

Jokes aside, this is almost certainly the BMS. Lightning is absolutely brutal on the protection circuitry — it's doing its job really, it's just... too good at it now.

Few things worth trying before assuming it's toast:

• **Hard

Worth checking if the BMS has a manual reset button or a separate low-voltage recovery mode first — some cheaper packs go into protection and just won't wake up without a small external charge nudged in via the balance leads.

Also had a similar scare with a battery in my shepherd's hut setup. Lightning nearby, BMS locked out completely. Ended up needing to contact the manufacturer directly as some have a reset procedure that isn't in the manual.

With the Felicity specifically, I'd check their Facebook group — a few people have had BMS lockouts and there's usually a walk-through floating around.

If the BMS is genuinely fried rather than just locked, replacements do exist but you'll want to match the cell configuration exactly. Might be worth getting a multimeter on the actual cells first to see if they're still holding voltage.

Good shout from @Fiona1974 on the reset — but with a lightning strike involved, I'd go a step further before assuming it's just a tripped BMS.

What I'd do first:

• Measure the actual cell voltage across the battery terminals with a multimeter. If it's reading below ~40V on a 48V pack, the BMS may have gone into hard undervoltage lockout
• Check for any burnt smell, scorch marks, or swollen cells — lightning surges can cook individual cell groups silently
• The BMS communication port (if it has one via RS485 or CAN) can tell you exactly what fault code triggered

Felicity packs aren't the most transparent when it comes to BMS diagnostics, but some have a USB monitoring port worth trying. If the cells themselves are intact, a BMS replacement is very achievable — Daly and JK BMS units are solid, affordable replacements that'll outlast the original.

@MarinePhil makes a fair point about being cautious with lightning damage — it's not always obvious where the damage has actually ended up.

One thing nobody's mentioned yet: check whether the BMS has blown an internal fuse. Some budget packs (and the Felicity falls into that bracket) have a small glass or blade fuse on the BMS board itself, separate from your main system fuse. If the strike caused a voltage spike, that's often the first thing to go.

You'll need to crack the casing open carefully and have a look. If you're not comfortable doing that, a local auto electrician or solar installer can check it quickly enough.

Also worth checking: are there any indicator LEDs on the BMS board itself when you apply charge? That'll tell you whether the board has any life at all before you go replacing anything.