Hi All,
As in the title I’m looking for advice about fuses, cables (AWG) en DC-switches to use.
Pylontech, Victron differ about these as does our national electric board (Dutch).
Please some advice. Thanx
With regards,
Jaap
This will normally take precedence, as the installation will need to be certified?
Always the larger of the cable / fuse specifications from the three should be used.
There are on line resources for the maximum ampacity of cables, fuses should be below the cable max carrying current. The pylontech battery cable connectors I think only take 25mm^2, so this should be respected.
| csa | max A |
|---|---|
| 1 | 15 |
| 1.5 | 21 |
| 2.5 | 27 |
| 4 | 36 |
| 6 | 47 |
| 10 | 62 |
| 16 | 80 |
| 25 | 107 |
| 35 | 128 |
| 50 | 157 |
Hi Mike,
Thanks for your swift answer. It’s helpfull. 
Confusing for me is how far you have to taken in account the normal, max and peak values in regards towards cables thickness and thereby fuse sizes as you stated. I expect that the Multiplus is leading in this case?
Thanx Jaap
Ok, so a regulator will always approve a larger cable size than the minimum.
so stick with Victron’s cable & Fuse sizes for the inverter to the busbar, and pylontech for the Dc cables battery to the busbar. Regulator specifies presence of isolation switches, fuses etc. Battery bus fuses are to protect the cable size used.
With solar installations, max currents can be sustained for up to 4 hours continuously, so as this is quite warming, solar charging cables and breakers are normally rated to 1.25 - 1.5 times the expected current. So the MPPT fuse should be 25 - 30A, and cable 4mm^2 or greater.
Inverter peak rating is a 10s rating, so usually ignored for cable sizing. so the inverter max current should be <65A, 16mm^2 can be used for short distances, 25 is better. Battery peak current is driven by the inverter plus any other dc loads, so fuse rating is to protect the battery cables i.e. <= 100A if 25mm cable is used.
As the batteries are of different types, you cannot assume equal current sharing, so each fuse needs to be >=80A (same as or greater than the inverter fuse).
Hello Mike,
Great to the point info.
Now confident enough to go ahead adding the distributor and US5000-1C.
Thanx very much,
Jaap