Hello. I need help. I have an off-grid photovoltaic system with a 24V, 3000W inverter, a 24V, 100Ah LiFePO4 lithium battery, and a 100A solar charge controller. Two panels are connected to the charge controller, totaling 1200W and delivering about 35 or 40A hour. The battery is connected to a busbar, and the inverter and controller are connected from there. I’d like to install a fuse on the positive terminal of the battery, but I’m unsure whether to use a 125A or 150A fuse. Could someone help me?
It depends on the following, in that order:
- Cable section
- Maximum battery discharge current
- Maximum inverter current
Assuming the cable is correctly oversized to continuously support 150A and give a low ripple, I would go with a fuse of 150A.
The MPPT needs fusing as well, on the input and output side.
Hola. Necesito ayuda. Tengo un sistema fotovoltáico fuera de la red que cuenta con un inversor de 24V y 3000W, una batería de 24V y 100A de litio lifepo4 y un controlador solar de 100A al que le tengo conectados dos paneles que juntos suman 1200W entregando unos 35 o 40 A hora. La batería la tengo conectada a una barra y de ahí conecto el inversor y el controlador. Quisiera ponerle un fusible en el borne positivo de la batería pero tengo dudas si debo ponerlo de 125A o de 150 A. Alguien pudiera ayudarme ?
Closer to 200A, check your inverter installation manual, Victron 3000W 24V inverters recommend 200A. Fuses should be 25% higher rating than max current. However, if your cable rating is less than 200A, then you will need a smaller fuse.