Actually the potential for sulfation DOES vary with manufacture, some
sulphate far slower than others. Temperature makes a big difference.
Check with your battery manufacturer if you want to know more.
> I think this is a great way to go if you lawn isn't too big. Tou don't wasnt the batteries under 50% discharge for more than around 24 hours or they will sulphate. So if your mowing only takes the batteries to 60-70 % discharge and you solar can get them up to full in three days you should be OK.
> Harbor Freight is selling a 45 watt solar that has a very good controller (The new one not the old one) that will give 2.5A for over 6 hours./day (12 volts) and costs less than $200. It is bigger than the mower but not much. The solar is in 3 panels, each of 15 watts and 12 volts. I notice that Camping World has the controller for under 75 watt panels for around $30.00 so with the extra controller and two of the Harbor Freight panels you should make some 5-7 AH/day or a charge from 70 % in about 2 days. I think it will work if you can keep the whole works dry.
> Now if you can just train your dog to fix the "User help needed" alarm...
> ----- Original Message -----
> From: Visti Juncher
> To: RoboMower@yahoogroups.com
> Sent: Thursday, July 31, 2008 4:00 PM
> Subject: [RoboMower] Re: Toying with idea...
> --- In RoboMower@yahoogroups.com, "David" <mercedes300dturbo@...> wrote:
> > Recently, I have just outfitted my RL500 with a set of solar panels
> > and bubble to keep the controls dry. The idea is: I hope to be able
> > to leave the RL500 outside and have it mow every time it becomes fully
> > charged. I have a connector that plugs into the battery. Once the
> > current comparator recognizes minimum current flow at ~24V, it uses a
> > solenoid to press the start button and begin the mowing process again.
> > I could just use a RL850 chip for the scheduling, but where do you
> > find one locally, and at what cost? I do like using the solar for
> > charging because the rapid charger produces a lot of heat in the
> > batteries.
> > At this moment, I'm nearly finished working out some minor bugs. But,
> > the solar panels do a great job for charging the batteries in 3 days.
> > That's about the schedule I use for mowing.
> I am not too fond of the idea. Batteries age due to the
> charge/discharge cycles AND due to time while discharged.
> You will have a considerable amount of time with discharged batteries
> which will shorten their lives.