All of the mowers use standard household current to charge
their batteries. Although a solar powered mower was available
for a time, it proved to be less than efficient. The batteries
themselves are Lead Acid (like your car), Lithium Ion (like
your cell phone) or Nickel Cadmium (like rechargeable tools).
Each has their advantages and disadvantages but were selected
to match the operational characteristics of the particular
Lead Acid has a reasonable service life, and it the least
expensive. It is also the heaviest. This can be a good thing
in that the weight helps in providing traction. The Robomow
models all use these as well as the Lawnbott LB2100 Professional.
They can tend to lose some capacity each year so make sure
that you don't go above the recommended lawn sizes. It may
cover it the first year....
Lithium Ion has a good service life and does not tend to
get weaker with age like lead acid batteries do but are
more expensive. They are amazingly light. So light, in fact,
they almost feel "empty" when you hold one. Their
weight to available power ratio make them very efficient
for robotic mowing because it takes power to haul the batteries
around the yard. The Lawnbott LB3200 and LB3500 both utilize
these and have available space for additional cells to boost
NiCad batteries are commonly found in rechargeable tools
of many kinds. They will build up a "memory" if
not discharged fully before each recharge. They "think"
that they only have enough power as the last few times used.
The BigMow uses this type of battery. Since the BigMow discharges
its batteries before returning to the dock, "memory"
will not come into play and they work very well.
Just a final word on Solar Power.
We have investigated this and found it to be cost prohibitive
for the average person to power their robot via the sun.
However, it you have a special application or the funds
to spare, we would be happy to assist you.