Fuses and Breakers
Electrical equipement is usually secured with fuses and/or circuit breakers. Those same rules and guidelines also apply to photo-voltage set-ups.
There is a big difference in AC (alternate current) and DC (direct current) circuit breakers. Household AC-breakers should not be used on the DC (battery) side. Special DC breakers or regular car-fuses can be a good alternative.
Regular car fuses, very widely available in many different electrical and mechanical sizes.
Maximum voltage on the standard fuses is 32V, so they can be used on 12V and 24V installations.
Seperate series are available that can be used up to 58V or 80V, so easy to use in 48V installations.
Available from 1A up to 40A in normal size and even up to 60A in maxi size.
A bit bigger currentwise, but also widely available are the so called ANL fuses, used in high-end car audio, but very nice for solar too.
Maximum voltage on the standard fuses is 80V, so they can be used on 12V, 24V and 48V installations.
Available from 35A up to 750A in ANL models and even up to 800A in ANN models.
Special DC Miniature Circuit Breakers have the big advantage that they can also be used as a seperater to switch of parts on you instalation in a secure way.
Depending on the brand operational voltages go from 125Vdc upto 440Vdc and they are available in single and double contacts.
Regular wides are available from 1A up to 63A and the wider versions even up to 125A.
These MCB’s can be mounted on a standard DIN rail.
There are also cut-off switches available. They don’t really offer any overload protaction. They could provide good services is you want to cut of your battery bank and do some save work or upgrades. They are available at different rates, 50A to start and upto 300 Amps or more.