A 125A Battery Fuse is an NH00 fuse link for the DC run between battery and inverter. It opens the circuit when a fault draws too much current, which keeps the battery cable protected.
Solar installers, homeowners and farms across South Africa use it as the battery fuse for inverter links. Mid-size hybrid inverters on 48V lithium banks are the typical fit for this rating.
Why Fit a 125A Battery Fuse
- Guards the 35mm battery cable against short-circuit damage.
- Sits inline on the DC link in NH00 size.
- Fills the gap when an electrician flags a missing fuse.
Key Specifications for NH00 Fuse
- 125A protection.
- Inline NH00 design.
- Ideal for solar inverters.
Compatibility With Battery and Inverter
Where the Fuse Goes
This NH00 inverter fuse belongs on the DC link between a 48V lithium bank and the hybrid inverter. On the same run, it pairs with 35mm battery cable and the Battery Busbar Box 5 Hole. Together, the fuse and a Battery Disconnect Switch 160A let you isolate the bank for servicing.
Matching Fuse Base
Mount it in an NH00 fuse base sized for this fuse. Our Fuse and Holder range lists a 32A DIN rail holder, but it takes 10x38mm string fuses only. Keep it off PV strings too, since they need the 10x38mm gPV Solar Fuse range at 1000V DC.
Choosing Between 125A Fuse and 160A
Pick the rating from the inverter’s maximum battery current, not from the battery size. Your 125A fuse must sit above normal operating current and within the cable rating. Check the inverter datasheet for that figure before you order.
When battery current runs close to 125A, step up to the 160A Battery Fuse instead. If a fuse blows, find the fault before you fit a new one.
Why Fuse With a BMS
A lithium BMS guards the cells, while this dc fuse guards the cable itself. Fitting both adds a second layer of protection on the battery run.
Signs a Fuse Has Blown
The inverter loses its battery connection when the fuse link opens. Test the NH fuse with a multimeter before replacing it. Replace it only with the same NH00 size and a matching rating.
Best Use Cases for 48V Banks
- Installers protecting battery cable on new 48V lithium installs.
- Homeowners adding batteries for backup through Eskom outages.
- Farms running borehole pumps and workshop tools on batteries.
Warranty Compliance And Trust
No test certificate is on file for this fuse. We state the 125A rating and NH00 size, not an approval. Ask for the warranty terms with your quote.
The IEC 60269 series covers low voltage fuses, including NH types. Ask us for a datasheet that references it and confirms the DC voltage rating.
SANS 10142-1 governs the installation wiring, which is the electrician’s responsibility, not a fuse certification. A registered person issues the Certificate of Compliance under the Electrical Installation Regulations. That certificate covers the installation and is not supplied with the fuse. Book professional solar installation when you want the battery run wired for you.
Solar Panel Energy supplies battery fuses across South Africa, with stock held in warehouses nationwide. Free system sizing comes with every quote, so you order the right rating first time. It suits installers and homeowners who need geyser and kettle loads to run without blowing the fuse.
Order your 125A Battery Fuse today, with nationwide delivery in 2 to 5 working days. Or ask our team to confirm the right rating for your inverter.
Last Updated: October 2026
