Gabriel_2018

Could you describe exactly what do you want to do?

I use a "fast rule". Fuses current shouldn´t be bigger than a half of Ah battery bank. For you, 400 Ah, you shouldný install a fuse bigger than 200 A. If you had a 1000 Ah battery bank, i would have said nothing, because Isc of those kind of banks use to be 10.000 A.

Hi @gabriel . You can control Axpert via commands. Do you have a Raspberry?

...yes...

You can solve It installing a bigger frame. For example, you can install a 160 A fuse in BUC NH0, or NH00 even NH1...

Concerning fuses, the smaller you can install the safer It is. It is not easy to choose a fuse for a battery, because shortcircuit current is not always the same. When we install a breaker in a grid install is very easy because shortcircuit current is known. In a battery bank, when time goes by ir the buttery isnt fully charged, Isc goes down, and the worst thing could happen is the fuse response time were higher, 0.5-1 s because those gap are an "eternity" for electronics

I dont agree at all...Victron doesnt know the size of your bank and shortcircuit current...

For example, we can imagine a geyser of 2 kW and an inverter which has an efficiency of 95% and battery Voltage is 48 V. Then current will be 2000/(0.95x48). Now if we have a motor of 2 kW and 4 KVA. Efficiency Will be round 93-94%, we could stimate, so, current woul be 2000/(0.93x48) and no 4000/(0.95x48). You can test It.

That's not exact at all. If we suppose no inverting loses we Will have 6500w/ cut off Voltage. You have to consider that if we have unclumped loads, when current and Voltage are opposite, the inverter works as rectifier. How? Current pass trough the antiparallel diodes of IGBT, so, the rise of loses are related to the rise of loses un IGBT, which are small.

In your signature appears your system is 16 Trojan T105, so battery bank is 48 V 400 Ah. We could suppose short circuit current of bank is 4000 A. In the table, for 4000 A, we can see time response for a 160 A fuse is 0.01 s and time response for a 315 A is 0.2 s. As you can imagine, it is better to have the lowest response time possible.

We shouldn´t forget the reason why we install a fuse. We don´t install to protect our inverters from overload; that thing do our inverters better than a fuse. We protect with a fuse to avoid damages in our installs from shortcircuit coming FROM batteries. So, if we have a 1000 Ah bank battery, its shortcircuit current could be 10.000 A (+-). Once we consider that, we can see in the table above that response time of fuse is less than 0.1 s. We should be sure concerning wires can withstand that amount of current in 0.1 s.

Hi @Jaco de Jongh You can install, safely a 160 A in your system. Here we have the time versus current for NH fuses. You can see that if current is round 300 A time is more than 100 s.

I´m sure @plonkster knows if Victron is prepairing something similar 😉

For example, only is an example, an Ingeteam inverter can be used whith a FREEDOM WON Lite HV. https://www.ingeconsuntraining.info/?page_id=15937

In my opinion, the most efficient system nowadays is "AC copupling" combined High Voltage Lithium battery.

Well, the most complex task in solar system is the boost stage. Inverters usually transform 48 Vdc to 400 Vdc. If solar panels and batteries work round 350-400 Vdc, stage booster is not needed.

Or may be you can use a high voltage batttery with the GTI and this: http://www.voltronicpower.com/oCart2/index.php?route=product/product&path=24&product_id=140

I suppose is the Infini 10 K. If your loads are heavy, or motors I wouldn't buy. I had a bad experience with one, capacitors blew Up in the first year...

Today we have a lovely day... https://thingspeak.com/channels/640675

They are like "B52s" then...

Wow...

Yes, you are right.

Fog is the same that night for solar pannels....😴 https://thingspeak.com/channels/640675

You won´t have any problem. Each module is protected.

In thingspeak we would see this: https://thingspeak.com/channels/640675