professor_jonny wrote:
Why? paralell up those batterys and pannels to 24vdc get your self a solar regulator inverter charger with a low volt timed relay output.
Did you and I go to the same school or is it just the Aussies and Kiwis think very much alike.
Because I run twin solar panels to each solar regulator, I have thought of simply wiring the panels in series rather than the parallel there in now and that will give me 24vDC off the panels and the regulators I use are 12vDc or 24vDC auto switching so that would have the panels, regulators running at 24vDC and then wire the battery bank in series /parallel and although that would drop the amp hours of the battery bank for the 1150 down to 575, it would also have the power supply up to 24vDC. Problems...All the accessories I run in the house, fridge, LCD T.V, radio, inverters for the lights etc all run on 12vDC. Easy fix, run a regulator on each line to drop the now 24vDc down to 12vDC. Problem, this will waste a lot of power as the regulators "bleed off" the extra volts. Possible solution. Wire only one pair of panels in series and have it's regulator charge on two of the batteries in the bank and have it only circuit that is actually 24vDC. What do you think?.
professor_jonny wrote:
then you can get your self an key start generator and connect it up to auto start when the batterys dip low.
then you have peace of mind if there is no sun to something goes wrong you wont dammage the batterys.
I did buy a self start petrol motor, ( 7.5HP), some time ago off EBay and plan on hooking up a car alternator to it like around 25amps because that is about as much as the 7.5 can spin without stalling the motor and have the motor auto start via a voltage detecting switch on the battery bank but I have to have the hub and key-way made up to suit the hub out of the motor to run the VEE belt to the car alternator. Haven't got around to that yet and it will live in the workshop area which I haven't quite finished yet.

Not far off completion.
professor_jonny wrote:
power is the current squared multiplied by resistance so doubling the voltage will reduce the power losses from resistance 24v is also a more common voltage from an industrial point that is.
yep well aware of that. I've been know to convert 12vDC up to 220vAC using an inverter and put a transformer on that line 100meters away to drop the 220vAC back down to 15vAC, regulate it and rectify it and end up with 12vDC again solely to prevent the 3-4 volt drop of the 12vDc going the100 meters.
professor_jonny wrote:
if you have tha cash spare get your self a mmpt solar setup such as a midnight classic it adjust the load on the cells to get the maximum power from the setup:
I use MMPT regulators. They promise to increase the power output by about 15% for the panels converting excess voltage to current which sounded good to me but I beg to differ on there claims of 15%. Panels are strange how they work at producing power that is actually useful. 1st thing is wattage is king with panels and that is the max rating so on a bright, sunny day, this is not equaling more current which determines how quick the batteries recharge. On such a bright, sunny day the panels may have as much as 21-23 volts being produced even though they are 12vDC rated. This voltage goes to the regulator and it drops the voltage down to the 14v-15vDC required to charge the batteries as the 21-23 volts from the panels would blow the batteries up. MMPT regulators are supposed to convert this excess voltage to current instead of just wasting it. Now let's do the maths- at 20volts say coming off the panel you would only have 5 amps coming from that panel because the panel is "100 watts" rated. Now let's drop that voltage down to 15vDC by simply putting shade cloth over that same panel on the same day under the same conditions. That same panel's voltage has dropped to much closer to that required for the batteries charging voltage and therefore less waste and because the panel is rated at 100 watts, it's output current or amps is raised and now 100 divided by 15 which is nearly 6.5 amps. Take off the shade cloth and let the MPPT regulator do it's alleged job and it drops to below 5 amps. I have panel voltage monitoring off each panel and ammeters so this is real easy for me to see in real time. If the 15% was indeed being produced, the amps would be over 5 amps at 21 volts from the panel, correct.
Personally, I believe the extra cost of MMPT regulator over standard regulators, it's nearly double here, is a waste of money myself.
professor_jonny wrote:
have you thaught of a water wheel in a river ? the local vet used a large cable drum and screwed nogs inbetween each side and dropped it in a river with a car alternator on the end of it with old vbelt and pulley.
you could stick a piston pump on the side to pump up to a hill with water and maybe use that to generate power?
Ow I wish I had a source of running water on my property. Two properties away does but not mine. I sold a wind generator I had so the guy could make a water wheel powered generator using it's AC generator rated at 200watts. He was a carpenter so a water wheel was real easy for him. We figured a floating wharf idea would be best to allow for the creek flooding. Actually, the floating wharf was merely a tree trunk with a bolt through it as the pivot to a post set in the bank and the other end had two drums and the generator hooked to the water wheel but it works quite nicely, for him.
