Deonsr

Thanx but Don helped me with the firmware. I'm gonna try installing it tonight. Thanks again Don.

Yes, 2 x Axpert 4,000w 5,000VA in Paralel with 16 x 170 A/h lead crystal batteries and 16 x 250 w PV's

What does it do and where do I find it. Currently I am running Watchpower on a Nextbook on Windows 10.
 

Nico you are lucky - 85% efficiency with only 15% losses. There are at least 6 types of losses in every PV installation:
Manufacturer’s power tolerance.  (1%) All panels have a power tollerance. Normally this is -1%/+3%. So worst case is that the specified power output is actually 1% lower than spec.


Temperature Loss. (10%) Solar panels don’t like to be hot. Most solar panels lose about 10% of their rated power on a 25°C day, more if it is hotter. Let’s assume 10% for this estimate. (1% for every 2 °C the panel temp is hotter than STC 25°C) On a 25°C ambient temp, the temp at the panel in full sun could easily be 40-50 °C) Dirt (5%) Soon after installation dust will settle on the panels’ glass. These  block the amount of sunlight reaching the solar cells behind the glass reducing your power. The reduction in power from dust build up typically lies in the 5%-15% range.
Wiring Losses (voltage drops) (2%) All the solar panels on your roof are interconnected with wires, then a long pair of DC wires connects the final solar panel to your inverter. All these wires have a small electrical resistance, which means the electricity flowing through them will suffer a voltage drop. This will reduce your power proportionally, typically by around 2%. (keep your wiring runs as short as possible)
Inverter Efficiency (4%) Everything goes through your inverter so the inverter efficiency will directly affect your system output. Depending on your inverter you can expect an inverter efficiency of about 96%, giving a 4% loss. Converting
(3%)
This is a difficult one to determine I like to think there is 1% loss from converting DC from the panels through the inverter. Charging batteries have another 1% loss, discharging from the batteries another 1%. The list actually just goes on and on. Even connectors not soldered or crimped correctly could be the reason for massive losses but that is a story for another day.
Multiply all those together and you are looking at 25% total losses which is not uncommon but reality. Giving a real world peak power of 4000w from a 4680w array is a loss of 680w - or 14.53%....you are very lucky.

Why would you want to re-invent the wheel?
It is common knowledge that iit is cheaper to save energy than to manufacture energy. The very first thing you do is install a solar geyser in your journey towards this goal. That is why they have been designed.
I do not have the exact facts but I am sure some of the fundi's on this forum will be able to give you the figures about collecting energy from the sun, converting it to DC, charging batteries, releasing the energy from the batteries to once manufacture AC and driving a gas mongrel of a geyser element. You have cabling distance losses, dust on panel losses and the losses are enormous every time you convert something in this manufacturing line.
I can not think that the 3 kw infinty with 3,000w panels and 500Ah batteries cost you less to install than a proper 300 liter solar geyser.